Cylinder-lock.



N. B. HURD.

CYLINDER LOCK. APPLICATION FILED mac. 1'2. 19H.

Patentd June 1, 1915.

5 vwe Mm flozvrzazz 5. Hard THE NORRIS PETERS C0,. PHOIFI I I'IHO" WISNINGTUN. D C

s AENT rib.

NORMAN B. I-IURD, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE AMERICAN HARDWARE CORPORATION, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

CYLINDER-LOCK.

Specification of Letters Patent.

Patented June 1, 1915.

Original application filed July 3, 1914, Serial No. 848,845. Divided and this application filed December 12, 1914. Serial No. 876,757.

To all whom it may concern:

Be it known that I, NORMAN B. HURD, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Cylinder-Locks, of which the following is a full, clear, and exact description.

This invention relates to cylinder locks and is designed to provide an operating rollback or cam having atleast three positions relative to the rotatable element or plug of the cylinder lock, means being provided for normally holding this cam in one of said positions, certain keys being designed to position this cam in the other positions. This invention constitutes a division of my application Serial No. 848,845, filed July 3rd,

191 1. Such a ro1l-back will afford a plurality of controls, as will be obvious.

A preferable embodiment of the invention is described in detail in the following specification and is illustrated in the accompanying drawings forming a part thereof, in which,

Figure 1 is a view in side elevation, partly in section, of a cylinder lock embodying the present invention. Fig. 2 is an end elevation of the parts shown in Fig. 1. Figs. 35 show views of the three classes of keys cooperating with the cylinder lock.

Referring to these drawings by numerals, 1 indicates the usual casing of the cylinder lock and 2 the usual rotatable element or plug therein, which element cooperates with a series of spring-pressed pin-tumblers (not shown) as usual in cylinder looks. The inner end of the plug is reduced and shouldered, as at 2 to receive thereon a fixed roll-back 4 having a recess at its lower end whereby it may fit over the shouldered end 2 of the plug. The usual keyhole slot 3 extends through the plug, the recess at the inner face of the roll-back 4: being in line with this keyhole slot. The inner face of the roll-back is channeled as at 5 and is provided with opposite vertical grooves 6 therein, within which is mounted avertically sliding plate 7 carrying at its upper end, and ofiset laterally from the body of the fixed roll-back 4, a relatively movable head forming a second roll-back 8. The lower end of the plate 7 is offset in a horizontal plane forming a strike or abutment surface 9, the extremity of this offset portion being turned downwardly again to provide a second abutment or strike surface 10 below the first abutment 9, both of these abutments being in the line of the keyhole slot 3 in the normal position of the plate 7. This normal position of the plate 7, in the present embodiment, is its lowermost position, the body of the fixed roll-back or cam a being recessed, as at 11, to provide a spring-pocket or groove, housing a coiled spring 12, whose upper end bears against the body of the roll-back, and whose lower end engages a pin 13 carried by and extending outwardly from the forward face of the plate 7. This spring normally presses the pin 13 against the upper face of the extension 2* of the plug and holds the plate 7 and the second cam or roll-back 8 in the lowermost position of the three positions, relative to the first cam or fixed roll-back 4. The plate and second cam are movable in the guideways 6 into second and third positions, through the cooperation therewith of certain keys.

A plurality of difierent types of keys cooperate with this cylinder lock, such keys being designated A, B, C, and at least two of these classes of keys being longer than the others and of different relative lengths. As will be seen in the drawings, Figs. 4 and 5, the keys of the classes B and C are longer than the keys of class A and are of difierent relative lengths.

As I have before stated, the two abutments or strike surfaces 9 and 10 are in the line of the keyhole slot 3. They are positioned, however, so that keys of the class A type or short keys are not of suiiicient length to extend through the plugslot to engage these abutment surfaces. Consequently, with a key of the class A, the fixed roll-back i may be rotated with the second roll-back 8 in one (and its normal) position relatively thereto. Keys of the class B type, however, are of sufficient'length to engage the strike surface 9, but not sufficiently long to engage the second strike surface 10. Consequently if a key of the class B type is used, its end will engage the strike surface 9 and lift the plate 7 and second roll-back 8 into a second position relative to the fixed rollback 4, which second position may be utilized to control certain specylinder lock mechanism wherein a movable roll-back is arranged to be given a plurality of controlling positions by a plurality of keys of different lengths, there being at least three different positions for the rollback and at least two long keys of different relative lengths. Such a mechanism will provide a plurality of controls for mechanism within a lock case and will tend to simplify the lock mechanism proper by placing control in the cylinder lock itself;

It will also be evident that while I have herein described a specific embodiment of my invention, the same is susceptible of variation both in structure and in relative arrangement of parts within the spirit of the invention and the scope of the appended claims.

What I claim is:

1. A cylinder lock comprising a casing, a rotatable element therein, a plurality of keys for rotating said element, a roll-back or cam operatively connected and rotated by the rotation of said element and having at least three different positions radially thereof,

with means normally tending to hold said cam in one of said positions, and means controlled by two different of said plurality of keys for moving said cam into a second and third of said positions, respectively.

2. A cylinder lock comprising a casing, a

' rotatable element therein, a plurality of keys for rotating said element, a roll-back or cam carried by and rotating with said element and having at least three different positions radially thereof, with means normally tending to hold said cam in one of said positions,'and means controlled by two diflerentof said plurality of keys for movingsaid caminto second and third positions, respec- V tively.

3. A cylinder lock comprising a casing, a rotatable element therein, aplurality of keys for rotating said element including at least two keys longer than the others and of different lengths relatively, a roll-back or cam carried by and rotating with said element and having at least three different positions,

radiaily't'hereof, with means normally tending to hold said cam in one of said positions, and with means. controlled by said two longer keys for moving said cam into the second and third positions, respectively.

4. A cylinder lock comprising a casing, a

rotatable element therein, a plurality of keys" for rotating said element including at least two keys longer than the others and each of different lengths'relatively, a roll-back or cam carried by'and rotating with said ele ment having atleast two spaced abutments and also having atleast three different posiv tions relative to said element with means normallytending to hold said cam in one of saidpositions, said'two longer keys being adapted to engage said two abutments re-' spectivelyto move said cam into second and third positions, respect1vely.- a

5. A. cylinder lock comprising a-'casing,'

a rotatable element therein, a plurality of keys for rotating said element, a roll-back or cam fixedly connected to and rotating with said element, a second and relatively movable cam carried by and rotating with.

the first'cam and having 'atleast three different positions relative thereto, with means normally holding said second cam in one of said positions, and with means controlled by two different of said plurality of keys for i moving said second cam into second and thlrd positions, respectively.

6. Acylinder lock comprising arcasing, a

cam in one of said positions, said cam'having at least two spaced abutments normally positioned in the line of said key-slot and arranged to be engaged by said two longer keys respectively, whereby said cam is moved into second and thirdpositions.

' NORMAN B. HURD. Witnesses: w

FRANK Y; SEARS, Gno. S. ELLioTr.

(Topics of this patent may be obtained for five cents each. by'addressing the Commissioner of Patents,

Washington, D. 0., 

